CN101391605A - Brake booster leak detection system - Google Patents
Brake booster leak detection system Download PDFInfo
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- CN101391605A CN101391605A CN 200810173705 CN200810173705A CN101391605A CN 101391605 A CN101391605 A CN 101391605A CN 200810173705 CN200810173705 CN 200810173705 CN 200810173705 A CN200810173705 A CN 200810173705A CN 101391605 A CN101391605 A CN 101391605A
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- brake
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
Abstract
A control system for evaluating a brake booster system includes an engine evaluation module that detects an engine off condition; a pressure evaluation module, during the engine off condition, monitors hydraulic brake line pressure, detects a change in brake booster pressure, and determines a brake booster vacuum decay rate based on the change in brake booster pressure; a fault reporting module detects a brake booster system fault based on the brake line pressure and the brake booster vacuum decay rate.
Description
The cross reference of related application
The application requires to enjoy the preceence of the U.S. Provisional Application of submitting on September 19th, 2,007 60/973,585, is incorporated herein its full content as a reference.
Technical field
The present invention relates to be used for the braking booster system of motor vehicle driven by mixed power.
Background technology
Statement only provides background information related to the present invention in this section and does not constitute prior art.
As the alternative of combustion engine, the automaker develops the hybrid powertrain that comprises electric traction mechanism and combustion engine simultaneously.In operational process, comprise that in the vehicle working power source of hybrid powertrain one or two raise the efficiency.
Motor vehicle driven by mixed power comprises that the linkage power train is under unified central planning and puts or serial power driving system configuration.In motor vehicle driven by mixed power in parallel, thereby motor and combustion engine concurrent working make the power of driving engine and scope advantage combine with efficiency of motor and electric power power of regeneration.In series hybrid vehicle, engine driven generators comes the electric power generation for the powered vehicle drive axle.This configuration allows motor to bear a part of engine power, therefore allows to use driving engine less, that efficient is higher.In addition for any one described hybrid power configuration, driving engine can cut out when vehicle parking and driver are still stepping on brake pedal.Doing like this can fuel saving, increases the tail-off time length when vehicle parking, has improved the fuel efficiency of hybrid power.
Some motor vehicle driven by mixed powers comprise vacuum controlled brake servo unit, the brake pedal force that has needed when described brake servo unit has reduced the car brakeing power that reaches expectation.These motor vehicle driven by mixed powers use engine intake manifold as the vacuum source that is stored in the vacuum in the brake servo unit.When in the hybrid power operational process during tail-off, keep limited degree of vacuum in the brake servo unit, described limited degree of vacuum is depleted along with the brake pedal adjustment.Need enough brake booster vacuum degree to keep brake boost at tail-off run duration motor vehicle driven by mixed power.If brake booster vacuum is reduced to below the threshold value in the hybrid power operational process of tail-off, driving engine will start makes brake booster vacuum to be replenished.
Usually brake booster vacuum is consumed in the brake adjusting process.The brake servo unit that leaks also can cause brake vacuum consumption and reduce the effect of brake servo unit.Leakage can cause brake booster vacuum to be reduced to the level that causes the inappropriate startup of driving engine.The motor vehicle driven by mixed power driving engine starts automatically when brake servo unit pressure is lower than threshold level.Therefore, leakage can be shortened the time that hybrid power engine is closed operation, and this can influence discharging and fuel efficiency.
Summary of the invention
A kind of control system that is used to assess braking booster system is provided, and it comprises the driving engine evaluation module of detection of engine closed condition; The pressure evaluation module, during the tail-off state, monitoring hydraulic braking line pressure detects the variation of brake servo unit pressure, and determines the brake booster vacuum rate of decay according to the variation of brake servo unit pressure; The error reporting module detects the braking booster system mistake according to the brake-pipe pressure and the brake booster vacuum rate of decay.
Another aspect provides a kind of method that is used for the brake monitoring booster system of vacuum leak, and it comprises the detection of engine closed condition; Under the tail-off state, the change of brake monitoring line pressure and definite brake servo unit pressure; Determine brake booster vacuum pressure attenuation speed according to the variation of brake servo unit pressure; Detect the brake servo unit mistake according to brake-pipe pressure and brake booster vacuum pressure attenuation speed.
Another aspect provides a kind of motor vehicle driven by mixed power, and it comprises driving engine; The brake booster vacuum system is communicated with the brake system fluid, with the air-distributor vacuum pressure communication of driving engine, and provide brake boost for brake system.First pressure sensor produces the brake-pipe pressure signal according to the brake-pressure of brake system.Second pressure sensor produces the brake servo unit pressure signal according to the brake servo unit pressure of brake booster vacuum system.Control module detects vacuum leak according to the brake-pipe pressure signal and the brake booster vacuum rate of decay in the brake booster vacuum system.Control module is determined the brake servo unit rate of decay according to the change of brake servo unit pressure signal.
Can understand other application of the present invention from following detailed description.Should be pointed out that these describe in detail and specific embodiment only is in order to explain, is not to be used for limiting the scope of the invention.
Description of drawings
The description of drawings here is not to be used for limiting the scope of the invention just in order to make an explanation.
Fig. 1 is the block diagram that expression comprises the motor vehicle driven by mixed power of the brake booster leak detection system of each side according to the present invention.
Fig. 2 is the data flow diagram of expression brake booster leak detection system of each side according to the present invention.
Fig. 3 is the diagram of circuit of expression brake booster leak method of inspection of each side according to the present invention.
The specific embodiment
Following explanation in fact only is an example, is not in order to limit the present invention and application thereof or use.Should be understood that in whole accompanying drawings that corresponding Reference numeral is represented identical or corresponding parts and feature.Here employed term " module " is meant the treater (shared, special-purpose or in groups) of special IC (ASIC), electronic circuit, the one or more softwares of execution or firmware program and memory device, combinational logic circuit, and/or other provides the suitable element of institute's representation function.
Referring now to Fig. 1, represented an example of motor vehicle driven by mixed power 10.Be understandable that brake booster leak method of inspection disclosed by the invention and system can be used to various series connection and motor vehicle driven by mixed power in parallel.For the purpose of example, brake booster leak method of inspection disclosed by the invention and system will discuss in conjunction with motor vehicle driven by mixed power in parallel.Vehicle 10 shown in Fig. 1 comprises the driving engine 12 of drive speed transmission 14.Change-speed box 14 can be the automatic or manual change-speed box that drives by corresponding tor-con or power-transfer clutch 16 launched machines 12.Driving engine 12 comprises N cylinder 18.Though 4 cylinders (N=4) have been shown among Fig. 1, have been understandable that driving engine 12 can comprise more or less cylinder 18.For example, driving engine can have 4,5,6,8,10,12 or 16 cylinders.The air that flows to driving engine 12 by throttle gate 20 enter induction maniflod 21 and in cylinder 18 and fuel combustion.
Vehicle 10 also comprises motor 22 and battery 24.Motor 22 operates in one of electric motor mode or generator mode.When operating in electric motor mode, motor 22 by battery 24 to its power supply.When at electric motor mode, motor 22 provides the active torque of auxiliary engine 12 and/or drive speed transmission 14.When operating in generator mode, thereby motor 22 generatings are to battery 24 chargings.Motor 22 can launched machine 12 or change-speed box 14 drivings.Be understandable that battery 24 can be to other vehicle accessory power supply except that motor 22.
The vehicle driver operates brake pedal 32 and regulates car brakeing.More specifically, brake system 36 is regulated car speed according to the power adjustment car brakeing that is applied on the brake pedal 32.Brake system gets help from braking booster system 37.Braking booster system 37 comprises vacuum-assisted brake servo unit 38, the negative pressure that described vacuum-assisted brake servo unit 38 acceptance are provided by one-way cock 39 by induction maniflod 21.Vacuum-assisted brake servo unit 38 uses negative pressure to provide extra power to brake with the driver assistance person as vacuum.
Force aid system for braking 37 guarantees have enough vacuum to be used to produce enough brake-pressures in the brake servo unit.Vacuum is provided for brake servo unit 38 by the pipeline 41 that extends from induction maniflod 21.Pipeline 41 comprises that permission flows to the check valve 39 of driving engine 12 from brake servo unit 38.When brake booster vacuum was less than the driving engine vacuum, check valve 39 was opened and is made brake booster vacuum increase up to equaling the driving engine vacuum.When the driving engine vacuum was low, check valve 39 kept higher degree of vacuum in the brake servo unit 38.When being employed, brake booster vacuum is depleted when the braking of brake system 36 (measuring by brake-pipe pressure).
For belt-driving starter generator (BAS) motor vehicle driven by mixed power, when drg is employed and car speed driving engine 12 when reducing to zero and when battery 24 is recharged or is in predetermined power level is in auto stop mode.Driving engine 12 also can be in auto stop mode when meeting other condition.When driving engine 12 was in auto stop mode and brake booster vacuum and is lower than threshold value, auto stop mode finished.In brake servo unit 38, provide enough degree of vacuum thereby the 12 automatic startings of control driving engine are turned round whole cylinders produces enough driving engine vacuum.The brake booster vacuum leakage can cause driving engine 12 stop automatically and automatically between the originate mode inadequately, too continually, than switching normal time shortly, and/or prevention (shortening) is out of service automatically.Therefore, brake booster leak can cause increases discharging and reduces fuel efficiency.Brake booster leak detection system detects the brake booster leak of various sizes and indicates this leakage to the driver, so that can take suitable action to repair leakage.
Brake booster leak detection system 37 comprises control module 26, described control module 26 brake monitoring servo-unit pressure sensors 40, brake piping or brake system pressure sensor 44 and manifold absolute pressure (MAP) sensor 43.Described first pressure sensor 40 produces brake servo unit pressure signal 42 according to the pressure that provides to vacuum-assisted brake servo unit 38.Second pressure sensor 44 produces brake-pipe pressure signal 46 according to the line pressure in the brake system 36.The 3rd pressure sensor 43 produces air-distributor pressure signal 45 according to the pressure in the induction maniflod 21.Control module 26 receive pressure signals 42,45 and 46 and braking booster system 37 in the detection vacuum leak.Can also comprise the atmosphere pressure sensor 47 that produces barometric pressure signal 50.
Braking booster system 37 also comprises one or more indicating devices 48 and diagnostic flag 49.Described indicating device 48 can be used to vehicle driver or the indication of brake servo unit technical personnel vacuum leak and the information relevant with this leakage, for example leakage size, leak position, leak type etc.Diagnostic flag 49 can be used to internal report vacuum leak and the details about leaking.Diagnostic flag 49 can be observed by the service facility diagnostic computer.
Referring now to Fig. 2, data flow diagram has illustrated the various embodiment that embed the brake booster leak detection system in the control module 26.Embodiment according to various brake booster leak detection systems disclosed by the invention can also comprise the many submodules that embed in the control module 26.Be understandable that shown subsystem can be merged and/or further be divided to carry out similar Leak Detection in vacuum-assisted brake servo unit 38.Can other control module detected, in vehicle 10 (as shown in Figure 1) be received and/or be determined from the input of vehicle 10 (as shown in Figure 1) by other submodule in the control module 26 to described system.In various embodiments, the control module 26 of Fig. 2 comprises driving engine evaluation module 51, pressure evaluation module 52 and error reporting module 54.
When being in when cutting out driving engine evaluation module 51 monitoring driving engine evaluate parameters 56, driving engine 12 determines.When driving engine 12 is in when cutting out, driving engine evaluation module 51 is provided with diagnosis and allows mark 58 to be TRUE.Otherwise diagnosis allows mark 58 still to be set to FALSE.Describe though embodiment disclosed herein relates generally to " when driving engine 12 is in when cutting out ", this embodiment also can be used to " when driving engine 12 is in when connecting ".When diagnosis allows mark 58 to be TRUE, pressure evaluation module 52 assessment pressure signals 42,45 and 46. Pressure signal 42,45 and 46 can filter by for example LPF 59.
The change of the error reporting module 54 assessment brake booster vacuum rates of decay 60 and brake-pipe pressure 62 determines whether to exist leaks.If the change of brake booster vacuum pressure attenuation speed 60 and/or brake-pipe pressure 62 indication vacuum leak or vacuum leak are greater than predeterminated level, report condition 64 is set to indicate exist and leaks, describes the information of leaking and/or detect failure.Otherwise, if the change of brake booster vacuum pressure attenuation speed 60 and/or brake-pipe pressure 62 indication is not leaked or is leaked in normal operating range, report condition 64 be set to indication do not have leakages, in normal operating range and/or detection pass through.In various embodiments, error reporting module 54 uses statistical filtering such as EWMA61 to filter brake booster vacuum pressure attenuation speed 60.The result that error reporting module 54 is assessed statistical filtering then determines whether to exist leakage.
Referring now to Fig. 3, flowchart text the brake booster leak method of inspection that each side can the control module 26 by Fig. 2 be carried out according to the present invention.Describe though following step relates generally to the embodiment of Fig. 1 and 2, these steps also can be modified to be applicable to other embodiment.Be understandable that the execution sequence of brake booster leak method of inspection step can change under the spirit that does not change described method.Described method can periodically be carried out in the control module operational process or come predetermined running according to certain event.Described method begins in step 100.In step 108, control determines whether about one or more vacuum transducer or the brake piping sensor error of existing in sensor 40,44 and 45.When the vacuum transducer mistake existed, control turned back to the step 100 of beginning, is directly to step 138, and/or end step 110.When the vacuum transducer mistake did not exist, control proceeded to step 112.
In step 112, the driving engine evaluate parameter can be monitored and assessment, and for example operational mode can be monitored.When driving engine 12 is in braking during stop mode, control proceeds to step 116, otherwise control turns back to beginning step 100, between proceed to step 138, and/or end step 110.
When test timer do not have expired and also step 124-128 in any condition do not satisfy at present that the step 116-130 of face repeats.In step 116, determine the variation of brake servo unit pressure.Initial brake booster vacuum pressure BBP
0Can obtained (step 116A) and connect with time=0, for example in the first time of step 116-130 cyclic process.Determine current brake booster vacuum pressure BBP
C(step 116B).Initial and current brake booster vacuum pressure can be filtered, and for example abates the noise by LPF.From current brake booster vacuum pressure BBP
CIn deduct initial brake booster vacuum pressure BBP
0Determine the change Δ BBP of brake booster vacuum pressure.
In step 118, determine the change of brake-pipe pressure.Initial brake-pipe pressure BLP
0Can obtained (step 118A) and connect with time=0, for example in the first time of step 116-130 cyclic process.Determine current brake-pipe pressure BLP
C(step 118B).Initial and current brake-pipe pressure can be filtered, and for example eliminates noise by LPF.From current brake-pipe pressure BLP
CIn deduct initial brake-pipe pressure BLP
0Determine the change Δ BLP of brake-pipe pressure.
In step 122, the refresh test timer.For example test timer can be increased by one.
In step 124, control determines whether current brake-pipe pressure BLP
CGreater than brake piping threshold value T
BLAs current brake-pipe pressure BLP
CGreater than brake piping threshold value T
BLThe time, control can be directly to step 138, otherwise control proceeds to step 126.For example, when the vehicle driver taked emergency braking, brake-pipe pressure was elevated to a high level.Control selects not carry out the brake booster leak detection when emergency braking.This can stop inaccurate Leak Detection to be measured.Usually when brake-pipe pressure not too high, and stablize glancing impact, unless have vacuum leak otherwise brake booster vacuum remains on a high level.
In step 126, control determines whether the threshold value T of the changes delta BLP of brake-pipe pressure greater than the variation of brake-pipe pressure
Δ BLPAs the changes delta BLP of described brake-pipe pressure threshold value T greater than the variation of brake-pipe pressure
Δ BLPThe time, control can be directly to step 138, otherwise control proceeds to step 128.The variation of bigger brake-pipe pressure can be indicated unsettled braking in the brake system.As an example, when braking " shake ", will there be significant the variation in brake-pipe pressure.Therefore brake booster vacuum is depleted.Thereby, detecting for preventing wrong brake booster leak, control can proceed to the bigger variation of step 138 and/or indication brake-pipe pressure.
In step 128, control determines whether current brake booster vacuum pressure BBP
CLess than the engine charge vacuum pressure.The engine charge vacuum pressure can be determined according to manifold absolute pressure signal 43 and barometric pressure signal in step 129.As current brake booster vacuum pressure BBP
CDuring less than the engine charge vacuum pressure, control can be directly to step 138, otherwise proceeds to step 130.When brake booster vacuum during less than the driving engine vacuum, check valve 21 is opened, thereby the stress level of vacuum system changes.Thereby do not carry out Leak Detection.
In step 130, control determines whether that test timer is expired.When test timer, control and proceed to step 132, otherwise step 116 is returned in control during the cycle greater than presumptive test.
In step 132, the brake booster vacuum rate of decay is determined in control.The brake booster vacuum rate of decay equals the cycle of the changes delta BBP of brake booster vacuum pressure divided by the schedule time or test timer.
In step 134, control is filtered the brake booster vacuum rate of decay by EWMA filtering 61.This provides the reliable diagnosis result.When force aid system for braking does not leak or leak very hour, the result after EWMA filtering 61 is filtered is near equaling 0.When having leakage, the result after EWMA filtering 61 is filtered increases and depends on the size of leakage.
In step 136, control determines whether to exist and leaks.When leakage existed, control was according to the definite size of leaking of the known parameters of the brake booster vacuum rate of decay and force aid system for braking, and for example scantling, member layout, brake servo unit dispose, normal engine turns round pressure etc.Leakage size is directly relevant with the brake servo unit rate of decay.
Leakage size can be detected between lower and high leakage threshold value, monitoring, assessment and report, and described low and high leakage threshold value changes according to concrete application and system.As an example, leakage size can be about 0.013 "-0.065 " between detected.Less than 0.013 " leakage can be considered to good/normal operational system.Greater than 0.065 " leakage can cause the quick interruption of auto stop mode.This bigger leakage can be passed through control module 26 detected and reports, and/or can the detected and report by another brake servo unit monitoring system.
In step 137, the result of control report brake booster vacuum pressure test.Usually, if the result of statistical filtering is zero or is lower than predetermined threshold value that leaking does not have to take place and test and pass through.If the result of statistical filtering greater than predetermined threshold value, takes place to leak and test crash.
Be understandable that,, carry out extra step with other system of failure notification and user in case report condition is set to test crash.In various embodiments, according to report condition diagnostic code is set.Described diagnostic code can be retrieved by service tools or be sent to far-end by telecommunication system.In various other embodiment, indicator lamp is lighted according to report condition.In various other embodiment, produce audible ringing signal according to report condition.
In step 138, the change of the brake booster vacuum pressure that resets, the change and the test timer of brake-pipe pressure.The brake booster vacuum rate of decay also is reset.
Be understandable that, above in question all comparisons can be used to various form according to value as a comparison.For example, in each embodiment comparison " greater than " can be used as " more than or equal to ".Similarly, in each embodiment comparison " less than " can be used as " smaller or equal to ".
In the vehicle operating process, can carry out said method.In other words, carry out described method when the vehicle ' process or when being in on-state.The power operation of vehicle by obtaining from battery 24 and/or motor 22.The brake monitoring booster vacuum rate of decay provides leak detection technology accurately.Described method does not rely on initial brake booster vacuum pressure, and is based on the change of brake booster vacuum pressure.Described method also seldom relies on the time length of time opening and brake booster vacuum pressure test.Time opening can be connected when initial brake servo unit and brake-pipe pressure are measured.Between time opening and last brake servo unit and brake-pipe pressure are tested, time length and time total amount are connected.At least because these reasons are carried out described method to determine brake booster vacuum pressure attenuation speed and/or leakage size accurately in the vehicle operating process.In addition, because can carry out said method when vehicle operating and tail-off, described method need control module 26 still not keep connecting behind combustion cutoff with the test related with it.Described method and vacuum test can be carried out when vehicle operating repeatedly, and do not need to carry out when vehicle cuts out.Saved battery power like this.
The foregoing description provides a kind of braking booster system and direct brake booster leak detection system based on leakage size of emission compliance.Starting or initial brake booster vacuum reduce to minimum not influence the output result of leak detection system.Leakage attenuation and various leakage size can be detected in a short period of time accurately.Detect accurately and help to guarantee suitable fuel efficiency.
The professional and technical personnel can understand from above-mentioned explanation now, and extensive content disclosed by the invention can utilize various forms to realize.So, though the present invention is illustrated in conjunction with its instantiation, true scope of the present invention should not be limited to this, because for the professional and technical personnel, studying accompanying drawing, specification sheets and following claim postscript, other modification is just apparent.
Claims (20)
1. control system that is used to assess braking booster system comprises:
The driving engine evaluation module of detection of engine closed condition;
The pressure evaluation module, it is monitored the hydraulic braking line pressure, detects the variation of brake servo unit pressure and determines the brake booster vacuum rate of decay according to the variation of described brake servo unit pressure under the tail-off state; And
Error reporting module according to described brake-pipe pressure and described brake booster vacuum rate of decay detection braking booster system mistake.
2. require 1 described system as profit, it is characterized in that, when brake-pipe pressure during less than threshold value, the pressure evaluation module is determined the variation of described brake servo unit pressure.
3. require 1 described system as profit, it is characterized in that, when the described brake booster vacuum rate of decay surpassed threshold value, described error reporting module detected the mistake of described braking booster system.
4. require 1 described system as profit, it is characterized in that, when the described brake booster vacuum rate of decay during less than predetermined threshold, described error reporting module produces report condition indication test and passes through.
5. require 1 described system as profit, it is characterized in that, the error reporting module is carried out statistical filtering to the described brake booster vacuum rate of decay, and detects the brake servo unit mistake according to the output selectivity ground of described statistical filtering.
6. require 5 described systems as profit, it is characterized in that, described statistical filtering is the index weighted moving average.
7. require 1 described system as profit, it is characterized in that, when tail-off parameter indication driving engine auto stop mode, described driving engine evaluation module detection of engine closed condition.
8. require 1 described system as profit, it is characterized in that, described pressure evaluation module is determined the variation of brake-pipe pressure, and
Wherein said pressure evaluation module is determined to determine the described brake booster vacuum rate of decay according to the variation of described brake-pipe pressure.
9. require 8 described systems as profit, it is characterized in that, when the variation of described brake-pipe pressure during less than threshold value, described pressure evaluation module is determined the described braking booster system vacuum rate of decay.
10. require 1 described system as profit, it is characterized in that, described pressure evaluation module is determined engine pressure, and
Wherein said pressure evaluation module is determined the described brake booster vacuum rate of decay according to described engine pressure.
11. require 10 described systems, it is characterized in that described pressure evaluation module is determined described engine pressure according to manifold absolute pressure and barometric pressure as profit.
12. a method that is used for the brake monitoring booster system of vacuum leak comprises:
The detection of engine closed condition;
Under the tail-off state, detect the change of brake-pipe pressure and definite brake servo unit pressure;
Determine brake booster vacuum pressure attenuation speed according to the change of described brake servo unit pressure; And
Detect the brake servo unit mistake according to brake-pipe pressure and described brake booster vacuum pressure attenuation speed.
13. require 12 described methods as profit, it is characterized in that, when described brake-pipe pressure during, carry out and determine brake booster vacuum pressure attenuation speed less than threshold value.
14. require 12 described methods as profit, it is characterized in that, when the described brake booster vacuum rate of decay surpasses threshold value, detect described brake servo unit mistake.
15. require 12 described methods as profit, it is characterized in that, also comprise when the described brake booster vacuum rate of decay surpasses threshold value, produce report condition indication test crash.
16. require 12 described methods as profit, it is characterized in that, also comprise when the described brake booster vacuum rate of decay during less than threshold value, produce report condition indication test and pass through.
17. a motor vehicle driven by mixed power that comprises driving engine comprises:
The brake booster vacuum system, it is communicated with the brake system fluid, with the air-distributor vacuum pressure communication of driving engine, with and provide brake boost to brake system;
Produce first pressure sensor of brake-pipe pressure signal according to the brake-pressure of brake system;
Produce second pressure sensor of brake servo unit pressure signal according to the brake servo unit pressure of brake booster vacuum system; And
Control module detects the intrasystem vacuum leak of brake booster vacuum according to the brake-pipe pressure signal and the brake booster vacuum rate of decay,
Wherein said control module is determined the described brake booster vacuum rate of decay according to the change of described brake servo unit pressure signal.
18. require 17 described motor vehicle driven by mixed powers as profit, it is characterized in that, when the brake-pipe pressure signal less than first threshold and brake booster vacuum pressure attenuation speed during greater than second threshold value, control module detects described vacuum leak.
19. require 17 described motor vehicle driven by mixed powers as profit, it is characterized in that, described control module detection of engine closed condition, and
Wherein said control module detects described vacuum leak under the tail-off state.
20. motor vehicle driven by mixed power as claimed in claim 17 is characterized in that, control module is carried out statistical filtering to described brake servo unit pressure attenuation speed, and
Wherein said control module detects vacuum leak according to the output of described statistical filtering.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US97358507P | 2007-09-19 | 2007-09-19 | |
| US60/973585 | 2007-09-19 | ||
| US12/013,676 US8899033B2 (en) | 2007-09-19 | 2008-01-14 | Brake booster leak detection system |
| US12/013676 | 2008-01-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101391605A true CN101391605A (en) | 2009-03-25 |
| CN101391605B CN101391605B (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810173705 Active CN101391605B (en) | 2007-09-19 | 2008-09-19 | Brake booster leak detection system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8899033B2 (en) |
| CN (1) | CN101391605B (en) |
| DE (1) | DE102008047379B4 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US8899033B2 (en) | 2014-12-02 |
| US20090071147A1 (en) | 2009-03-19 |
| DE102008047379B4 (en) | 2019-01-03 |
| DE102008047379A1 (en) | 2009-04-23 |
| CN101391605B (en) | 2010-12-22 |
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